题目内容
Early astronomers believed that the sky was a crystal shell or series of crystal shells because________
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If you want to download what you have done with the magic pen，__________．
Why do the English keep black cats？
[A] To catch mice.
[B] To protect the babies.
[C] To bring them good luck
Soldiers have to obey（A级）orders．
The old concerns lose importance and some of them vanished altogether．
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